Investigation of structural and mechanical properties of magnetic pulse welded dissimilar aluminum alloys

Pourabbas, Mehdi; Abdollah-zadeh, A.; Sarvari, Morteza; Pouranvari, M.; Miresmaeili, Reza

doi:10.1016/j.jmapro.2018.12.002

Cited by 26 publications

(13 citation statements)

References 23 publications

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“…The mechanical macro-quality of the joints was assessed by manual peel test, as previously performed by others [12][13][14]43]. The outcome at the coil's slot (0 • ) is of special interest due to the locally reduced magnetic field intensity in the area, leading to possible local discontinuities and low mechanical properties (Figure 4).…”

Section: Peel Testsmentioning

confidence: 99%

“…The outcomes are in good agreement with the well-known PDV (photon Doppler velocimetry) demonstrating good repeatability; for example, Lueg-Althoff and his colleagues [12] showed "that the minimum radial impact velocity required for welding with the same geometrical setup can be reduced significantly at low discharge frequencies compared to high one". Pourabbas et al [13] studied the MPW of AA4014 to AA7075 and found that variety of welding parameters were carefully chosen to acquire acceptable welds. In addition, three modes of welding interfaces with wavy, molten wavy, and porous morphologies were detected.…”

Section: Introductionmentioning

confidence: 99%

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On Additive Manufactured AlSi10Mg to Wrought AA6060-T6: Characterisation of Optimal- and High-Energy Magnetic Pulse Welding Conditions

Nahmany

Shribman

Levi³

et al. 2020

Metals

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This novel research aims to examine the macro and microstructural bonding region development during magnetic pulse welding (MPW) of dissimilar additive manufactured (AM) laser powder-bed fusion (L-PBF) AlSi10Mg rod and AA6060-T6 wrought tube, using both optimal- and high-energy welding conditions. For that purpose, various joint characterisation methods were applied. It is demonstrated that high-quality hermetic welds are achievable with adjusted MPW process parameters. The macroscale analysis has shown that the joint interfaces are deformed to a waveform shape; the interface is starting relatively planar, with waves forming and growing in the welding direction. The observed thickening of the flyer’s wall after welding is the result of its diametral inward deformation, taking place during the process. A slight increase in microhardness was adjacent to the faying interfaces; a higher increase was measured on the AlSi10Mg material side, while a smaller one was observed on the AA6060 side. Along the wavy interfaces, resolidified “pockets” of material or occasionally discontinuous short layers exhibiting different morphologies, were detected. The jet residues are typically located towards the end of the weld, confirming a temperature rise that exceeds the melting temperature of both alloys. Far from the weld zone, extremely thin-film deposits were clearly observed on the inner flyer surfaces. The formation of isolated Si particles and thin-film deposits may point out that the local increase in temperatures leads to melting or even evaporation vaporisation of superficial layers from the colliding parts. It is worth noting that this type of jet residue was discovered for the first time in the present research. The current research work is expected to provide an understanding of weld formation mechanisms of additively manufactured parts to conventional wrought parts conforming to existing wrought/wrought weld knowledge.

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Section: Peel Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On Additive Manufactured AlSi10Mg to Wrought AA6060-T6: Characterisation of Optimal- and High-Energy Magnetic Pulse Welding Conditions

Nahmany

Shribman

Levi³

et al. 2020

Metals

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“…Fatigue fracture is one of the main failure modes for Al alloy components with welded joint. There are many factors affecting the fatigue properties of Al alloy components with welded joint, such as welding defects, 8,9 the stress concentration caused by weld shape, 10 residual stress, 11,12 strength matching between the base metal and the solder, 13 and the microstructural changes of welded joints 14,15 . Investigations on the fatigue properties of welded joint show that the main cause for the fatigue life loss of welds can be mainly attributed to two aspects: the evolution of microstructure caused by the heat input and the drop of mechanical properties caused by the welding defects.…”

Section: Introductionmentioning

confidence: 99%

Improving fatigue life of 7N01 Al alloy weld by surface spinning strengthening

Wang

et al. 2021

Fatigue Fract Eng Mat Struct

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The purpose of this study is to improve the surface microstructure and mechanical properties of 7N01 Al alloy welded joints by surface spinning strengthening (3S), so as to improve the fatigue life at certain stress. Results show that after the 3S treatment, the microhardness of the welded joint increases significantly due to the introduction of some nanoprecipitates and dislocations, and the strength and elongation increase simultaneously. The minimum fatigue life of the welded specimen under the condition of maximum stress of 150 MPa and stress ratio of 0.1 is increased from less than 106 cycles to more than 3 × 106 cycles after the 3S treatment. Fracture surface analysis shows that the crack initiation site of the sample with welded joint is turned from the surface to the subsurface after 3S treatment, which is beneficial to the elimination of surface defect and the improvement of surface strength.

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“…They observed three distinct bonding zones, i.e., solid-state bonding, homogeneous-liquid-state bonding, and liquid-state bonding with pores and cracks, but the formation mechanisms need to be identified. Pourabbas et al [10] reported a porous structure existing in the AA7075/AA4014 pipe joint, which might account for the freezing of trapped air or vaporized aluminum during swift solidification. Geng et al [11] studied the interfacial transition zone of an EMPWed AA5182/HC340LA lap joint and concluded that the Fe element appeared in three forms in the diffusion zone: Fe-Al IMCs, Fe-Al supersaturated solid solution, and dispersed Fe particles in Al matrix.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Wang

Chen

Yan

et al. 2021

Metals

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The aim of this study was to characterize detailed microstructural changes and bonding characteristics and identify the formation mechanism of collision surface of Al6061–Q355 steel dissimilar welded joints via electromagnetic pulse welding (EMPW). The collision surface was observed to consist of five zones from the center to the outside. The central non-weld zone exhibited a concave and convex morphology. The welding-affected zone mainly included melting features and porous structures, representing a porous joining. The secondary weld zone presented an obvious mechanical joining characterized by shear plateaus with stripes. The primary weld zone characterized by dimples with cavity features suggested the formation of diffusion or metallurgical bonding. The impact-affected zone denoted an invalid interfacial bonding due to discontinuous spot impact. During EMPW, the impact energy and pressure affected the changes of normal velocity and tangential velocity, and in turn, influenced the interfacial deformation behavior and bonding characteristics, including the formation of micropores which continued to grow into homogeneous or uneven porous structures via cavitation, surface tension, and depressurization, along with the effect of trapped air.

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Investigation of structural and mechanical properties of magnetic pulse welded dissimilar aluminum alloys

Cited by 26 publications

References 23 publications

On Additive Manufactured AlSi10Mg to Wrought AA6060-T6: Characterisation of Optimal- and High-Energy Magnetic Pulse Welding Conditions

On Additive Manufactured AlSi10Mg to Wrought AA6060-T6: Characterisation of Optimal- and High-Energy Magnetic Pulse Welding Conditions

Improving fatigue life of 7N01 Al alloy weld by surface spinning strengthening

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

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